Add unistd.h checks back to the CMake build.

getpagesize(), as well as its POSIX.2001 replacement
sysconf(_SC_PAGESIZE), is defined in <unistd.h>. On Linux and OS X,
including <sys/mman.h> is sufficient to get a definition for
getpagesize(). However, this is not true for the Android NDK. This CL
brings back the HAVE_UNISTD_H definition and its associated header
check.

This also adds a HAVE_FUNC_SYSCONF definition, which checks for the
presence of sysconf(). The definition can be used later to replace
getpagesize() with sysconf().

1 files changed, 6 insertions, 0 deletions

diff --git a/cmake/config.h.in b/cmake/config.h.in
index a14c7ad..64f2648 100644
--- a/cmake/config.h.in
+++ b/cmake/config.h.in
@@ -13,6 +13,9 @@
 /* Define to 1 if you have a definition for mmap() in <sys/mman.h>. */
 #cmakedefine HAVE_FUNC_MMAP 1
 
+/* Define to 1 if you have a definition for sysconf() in <unistd.h>. */
+#cmakedefine HAVE_FUNC_SYSCONF 1
+
 /* Define to 1 to use the gflags package for command-line parsing. */
 #cmakedefine HAVE_GFLAGS 1
 
@@ -46,6 +49,9 @@
 /* Define to 1 if you have the <sys/uio.h> header file. */
 #cmakedefine HAVE_SYS_UIO_H 1
 
+/* Define to 1 if you have the <unistd.h> header file. */
+#cmakedefine HAVE_UNISTD_H 1
+
 /* Define to 1 if you have the <windows.h> header file. */
 #cmakedefine HAVE_WINDOWS_H 1